Prostate Specific Antigen (PSA) test

What is is?

Prostate specific antigen is a protein manufactured exclusively by the prostate gland.

How does it work?

This antigien is present at low levels (0-4.0 ng/mL) in the blood serum of healthy men. However, increased levels of this antigen are present in the blood of an individual with prostate cancer.


This discovery has lead to a simple blood test  effectlivly being used in the early detection of prostate cancer.

  • PSA levels of less than 4 ( may vary with age ) are considered normal
  • it is important to note that prostate cancer may exist even with PSA levels in the normal range.
  • PSA levels over 4 may be considered elevated and may indicate benign disease or prostate cancer.
  • The higher the PSA level, the more likely the presence of cancer.
  • This test may be routinely used to detect prostate cancer in men over 50
  • Men at a higher risk of prostate cancer or with a family history of prostate cancer may wish to consulting their family physician about this test to begin screening when they are 40-45 years old.


The BC Cancer Agency. 2009. Prostate Cancer. Retrived June 26, 2009 from

The US National Cancer Insitite. 2009. Prostate Specific Antigen (PSA) Test. retrieved June 26, 2009 from


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